// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package com.google.firebase.gradle.plugins

class Memoize1<in T, out R>(val f: (T) -> R) : (T) -> R {
    private val values = mutableMapOf<T, R>()
    override fun invoke(x: T): R {
        return values.getOrPut(x, { f(x) })
    }
}

fun <T, R> ((T) -> R).memoize(): (T) -> R = Memoize1(this)
